2 * This file is part of Libav.
4 * Libav is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
9 * Libav is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with Libav; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 * misc image utilities
30 void av_image_fill_max_pixsteps(int max_pixsteps[4], int max_pixstep_comps[4],
31 const AVPixFmtDescriptor *pixdesc)
34 memset(max_pixsteps, 0, 4*sizeof(max_pixsteps[0]));
35 if (max_pixstep_comps)
36 memset(max_pixstep_comps, 0, 4*sizeof(max_pixstep_comps[0]));
38 for (i = 0; i < 4; i++) {
39 const AVComponentDescriptor *comp = &(pixdesc->comp[i]);
40 if ((comp->step_minus1+1) > max_pixsteps[comp->plane]) {
41 max_pixsteps[comp->plane] = comp->step_minus1+1;
42 if (max_pixstep_comps)
43 max_pixstep_comps[comp->plane] = i;
48 int av_image_get_linesize(enum AVPixelFormat pix_fmt, int width, int plane)
50 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
51 int max_step [4]; /* max pixel step for each plane */
52 int max_step_comp[4]; /* the component for each plane which has the max pixel step */
56 return AVERROR(EINVAL);
58 if (desc->flags & AV_PIX_FMT_FLAG_BITSTREAM)
59 return (width * (desc->comp[0].step_minus1+1) + 7) >> 3;
61 av_image_fill_max_pixsteps(max_step, max_step_comp, desc);
62 s = (max_step_comp[plane] == 1 || max_step_comp[plane] == 2) ? desc->log2_chroma_w : 0;
63 return max_step[plane] * (((width + (1 << s) - 1)) >> s);
66 int av_image_fill_linesizes(int linesizes[4], enum AVPixelFormat pix_fmt, int width)
69 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
70 int max_step [4]; /* max pixel step for each plane */
71 int max_step_comp[4]; /* the component for each plane which has the max pixel step */
73 memset(linesizes, 0, 4*sizeof(linesizes[0]));
75 if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
76 return AVERROR(EINVAL);
78 if (desc->flags & AV_PIX_FMT_FLAG_BITSTREAM) {
79 if (width > (INT_MAX -7) / (desc->comp[0].step_minus1+1))
80 return AVERROR(EINVAL);
81 linesizes[0] = (width * (desc->comp[0].step_minus1+1) + 7) >> 3;
85 av_image_fill_max_pixsteps(max_step, max_step_comp, desc);
86 for (i = 0; i < 4; i++) {
87 int s = (max_step_comp[i] == 1 || max_step_comp[i] == 2) ? desc->log2_chroma_w : 0;
88 int shifted_w = ((width + (1 << s) - 1)) >> s;
89 if (max_step[i] > INT_MAX / shifted_w)
90 return AVERROR(EINVAL);
91 linesizes[i] = max_step[i] * shifted_w;
97 int av_image_fill_pointers(uint8_t *data[4], enum AVPixelFormat pix_fmt, int height,
98 uint8_t *ptr, const int linesizes[4])
100 int i, total_size, size[4] = { 0 }, has_plane[4] = { 0 };
102 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
103 memset(data , 0, sizeof(data[0])*4);
105 if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
106 return AVERROR(EINVAL);
109 if (linesizes[0] > (INT_MAX - 1024) / height)
110 return AVERROR(EINVAL);
111 size[0] = linesizes[0] * height;
113 if (desc->flags & AV_PIX_FMT_FLAG_PAL ||
114 desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL) {
115 size[0] = (size[0] + 3) & ~3;
116 data[1] = ptr + size[0]; /* palette is stored here as 256 32 bits words */
117 return size[0] + 256 * 4;
120 for (i = 0; i < 4; i++)
121 has_plane[desc->comp[i].plane] = 1;
123 total_size = size[0];
124 for (i = 1; i < 4 && has_plane[i]; i++) {
125 int h, s = (i == 1 || i == 2) ? desc->log2_chroma_h : 0;
126 data[i] = data[i-1] + size[i-1];
127 h = (height + (1 << s) - 1) >> s;
128 if (linesizes[i] > INT_MAX / h)
129 return AVERROR(EINVAL);
130 size[i] = h * linesizes[i];
131 if (total_size > INT_MAX - size[i])
132 return AVERROR(EINVAL);
133 total_size += size[i];
139 int avpriv_set_systematic_pal2(uint32_t pal[256], enum AVPixelFormat pix_fmt)
143 for (i = 0; i < 256; i++) {
147 case AV_PIX_FMT_RGB8:
152 case AV_PIX_FMT_BGR8:
157 case AV_PIX_FMT_RGB4_BYTE:
162 case AV_PIX_FMT_BGR4_BYTE:
167 case AV_PIX_FMT_GRAY8:
171 return AVERROR(EINVAL);
173 pal[i] = b + (g<<8) + (r<<16);
179 int av_image_alloc(uint8_t *pointers[4], int linesizes[4],
180 int w, int h, enum AVPixelFormat pix_fmt, int align)
182 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
187 return AVERROR(EINVAL);
189 if ((ret = av_image_check_size(w, h, 0, NULL)) < 0)
191 if ((ret = av_image_fill_linesizes(linesizes, pix_fmt, w)) < 0)
194 for (i = 0; i < 4; i++)
195 linesizes[i] = FFALIGN(linesizes[i], align);
197 if ((ret = av_image_fill_pointers(pointers, pix_fmt, h, NULL, linesizes)) < 0)
199 buf = av_malloc(ret + align);
201 return AVERROR(ENOMEM);
202 if ((ret = av_image_fill_pointers(pointers, pix_fmt, h, buf, linesizes)) < 0) {
206 if (desc->flags & AV_PIX_FMT_FLAG_PAL || desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL)
207 avpriv_set_systematic_pal2((uint32_t*)pointers[1], pix_fmt);
212 typedef struct ImgUtils {
213 const AVClass *class;
218 static const AVClass imgutils_class = { "IMGUTILS", av_default_item_name, NULL, LIBAVUTIL_VERSION_INT, offsetof(ImgUtils, log_offset), offsetof(ImgUtils, log_ctx) };
220 int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
222 ImgUtils imgutils = { &imgutils_class, log_offset, log_ctx };
224 if ((int)w>0 && (int)h>0 && (w+128)*(uint64_t)(h+128) < INT_MAX/8)
227 av_log(&imgutils, AV_LOG_ERROR, "Picture size %ux%u is invalid\n", w, h);
228 return AVERROR(EINVAL);
231 void av_image_copy_plane(uint8_t *dst, int dst_linesize,
232 const uint8_t *src, int src_linesize,
233 int bytewidth, int height)
237 for (;height > 0; height--) {
238 memcpy(dst, src, bytewidth);
244 void av_image_copy(uint8_t *dst_data[4], int dst_linesizes[4],
245 const uint8_t *src_data[4], const int src_linesizes[4],
246 enum AVPixelFormat pix_fmt, int width, int height)
248 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
250 if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
253 if (desc->flags & AV_PIX_FMT_FLAG_PAL ||
254 desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL) {
255 av_image_copy_plane(dst_data[0], dst_linesizes[0],
256 src_data[0], src_linesizes[0],
258 /* copy the palette */
259 memcpy(dst_data[1], src_data[1], 4*256);
261 int i, planes_nb = 0;
263 for (i = 0; i < desc->nb_components; i++)
264 planes_nb = FFMAX(planes_nb, desc->comp[i].plane + 1);
266 for (i = 0; i < planes_nb; i++) {
268 int bwidth = av_image_get_linesize(pix_fmt, width, i);
269 if (i == 1 || i == 2) {
270 h= -((-height)>>desc->log2_chroma_h);
272 av_image_copy_plane(dst_data[i], dst_linesizes[i],
273 src_data[i], src_linesizes[i],